Question

At the top of the trajectory of a projectile, the direction of its velocity and acceleration are:

• A. Perpendicular to each other
• B. Parallel to each other
• C. Inclined to each other at an angle of ${45}^o$
• D. Anti-parallel to each other

Answer 1

Answer: (A)

Perpendicular to each other

Direction of velocity is always tangent to the path, so at the top of trajectory it is horizontal direction and acceleration due to gravity is always in vertically downward direction.
Hence, $v$ and $g$ are perpendicular to each other.